Harnessing new digital technologies to support the delivery of health services centred around the needs of patients has been embraced by the National Health Service (NHS) in England.1 Digital technologies—eg, apps, wearables, and software algorithms—have the potential to support a technology-enabled health system in which care interactions are moved away from formal settings and citizens are encouraged to manage their own health and illness. The scalability and often low marginal cost of digital interventions suggest they might deliver cost benefits to stretched services facing the demands of ageing populations living longer with higher levels of chronic disease.